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doc: Cross-reference virtual build machines from ‘guix time-machine’.

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* doc/guix.texi (Invoking guix time-machine): Tweak the note about
packages that may fail to build.  Add cross-reference to virtual build
machines.

Change-Id: Ib2a4a28cdca0c8970d0f5327e39b4a21800ea2e1
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Ludovic Courtès 2024-03-29 22:40:52 +01:00
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doc/guix.texi
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@ -5029,10 +5029,10 @@ Although it should technically be possible to travel to such an old
commit, the ease to do so will largely depend on the availability of
binary substitutes. When traveling to a distant past, some packages may
not easily build from source anymore. One such example are old versions
of Python 2 which had time bombs in its test suite, in the form of
expiring SSL certificates. This particular problem can be worked around
by setting the hardware clock to a value in the past before attempting
the build.
of OpenSSL whose tests would fail after a certain date. This particular
problem can be worked around by running a @dfn{virtual build machine}
with its clock set to the right time (@pxref{build-vm, Virtual Build
Machines}).
@end quotation
The general syntax is: